Girls, we're 10 weeks pregnant, today my belly is already hard in the…

Girls, we're 10 weeks pregnant, today my belly is already hard in the lower abdomen and pulls, the pain slightly goes into the back passage (sorry for the details). I think it's a spasm, something like this happens after I sit down or stand up for a while or lie down in an uncomfortable position, at least 15-20 minutes. After lying down, it passes, then again...how do others deal with this, what can be done in such a situation and is it dangerous for the baby? There are no suspicious discharge.